Eleven New Species and a New Genus of Diastylidae (Crustacea: Cumacea) from Australia and One New Species from Canada Author Gerken, Sarah text Records of the Australian Museum 2014 2014-02-26 66 1 1 62 http://dx.doi.org/10.3853/j.2201-4349.66.2014.1601 journal article 10.3853/j.2201-4349.66.2014.1601 2201-4349 4684387 Paradiastylis berentsae n. sp. Figs 32–33 Type material . Holotype ovigerous female, AM P53670; paratype ovigerous female, dissected, AM P85809; 33°58'39"S 151°12'22"E , 7.5 m , State Pollution Control Commission, 8 Dec. 1976 . Paratypes 5 individuals, P63682, 33°59'24"S 151°12'48"E , 20 m , State Pollution Control Commission, 7 Feb. 1977 . Other material examined . 1 individual, P41995; 2 individuals, P41996; 33°58'17"S 151°11'58"E , 7 m , Australian Museum , 7 Apr. 1992 . 1 female , AM P53668, 33°57'12"S 151°10'E , 3 m , State Pollution Control Commission , 3 Dec. 1976 . 2 individuals, AM P53669, 33°58'38"S 151°12'28"E , 7.5 m , State Pollution Control Commission , 13 Dec. 1976 . 2 individuals, AM P53672, 33°58'52"S 151°12'23"E , 7.6 m , State Pollution Control Commission , 13 Dec. 1976 . 1 individual, AM P53673, 33°58'47"S 151°12'16"E , 8 m , State Pollution Control Commission , 13 Dec. 1976 . 1 individual, AM P53674, 33°59'24"S 151°12'48"E , 21 m , State Pollution Control Commission , 24 Jan. 1977 . 5 individuals, AM P53675, 34°00'S 151°14'E , 21 m , 24 Jan. 1977 . 2 individuals, AM P53676; 1 individual, AM P53677; 34°00'S 151°14'E , 11–13 m , 27 Jan. 1977 . 1 individual, AM P53678, 33°59'18"S 151°12'38"E , 19.2 m , State Pollution Control Commission , 2 Feb. 1977 . 2 individuals, AM P53679, 33°59'59"S 151°12'01"E , 4.5 m , State Pollution Control Commission , 2 Feb. 1977 . 1 individual, AM P53680, 33°59'35"S 151°12'56"E , 20 m , State Pollution Control Commission , 4 Feb. 1977 . 2 females , AM P53683, 34°00'S 151°12'E , 13 m , State Pollution Control Commission , 10 Mar. 1977 . 2 ovigerous females, 1 subadult female, AM P53684, 33°59'24"S 151°12'48"E , 13 m , State Pollution Control Commission , 10 Mar. 1977 . 2 ovigerous females, 3 subadult females, 1 juvenile , P42012, 33°58'45"S 151°11'02"E , 7 m , Australian Museum , 28 July 1992 . 1 individual, AM P53687, 33°34'S 151°16'E , 10 m , A. R . Jones and A. Murray , 18 Sept. 1980 . 1 individual, AM P53688, 33°35'S 151°17'E , 4 m , A. R . Jones and A. Murray , 21 Aug. 1984 . 1 individual, AM P85810, 33°58'39"S 151°12'22"E , 7.5 m , State Pollution Control Commission , 8 Dec. 1976 . 1 individual, AM P85811, 27°13'20"S 160°43'25"E , 1989 m , J. K. Lowry , 7 May 1989 . 1 female , AM P85812, 33°34'30"S 151°16'30"E , 4 m , A. R . Jones and A. Murray , 27 May 1983 . 1 female , AM P85813, 33°33'S 150°14'E , 4 m , A. R . Jones, C. J . Watson-Russell, F . Byers , 1 Aug. 1979 . 1 individual, AM P85814, 33°33'S 151°14'E , 4 m , A. R . Jones, C. J . Watson-Russell, F . Byers , 18 Dec. 1979 . 1 individual, AM P85815, 33°33'S 151°14'E , 4 m , A. R . Jones, C. J . Watson-Russell, F . Byers , 21 Aug. 1980 . 1 individual, AM P85816, 33°35'S 151°17'E , 4 m , A. R . Jones and A. Murray , 9 Nov. 1982 . 1 female , AM P85817, 33°35'S 151°17'E , 4 m , A. R . Jones and A. Murray , 21 Aug. 1984 . 1 female , AM P85818, 33°35'S 151°17'E , 4 m , A. R . Jones and C. J. Watson-Russell , 5 Feb. 1977 . 1 female , AM P85819, 33°35'S 151°17'E , 4 m , A. R . Jones and C. J. Watson-Russell , 5 Feb. 1979 . 1 female , AM P85820, 33°35'S 151°17'E , 4 m , A. R . Jones and C. J. Watson-Russell , 13 Nov. 1979 . 1 individual, AM P85821, 33°35'S 151°17'E , 4 m , A. R . Jones and A. Murray , 9 Feb. 1984 . 1 individual, AM P85822, 33°35'S 151°17'E , 12 m , A. R . Jones and A. Murray , 22 Nov. 1976 . 1 female , AM P85823, 33°34'S 151°16'E , 10 m , A. R . Jones and A. Murray , 20 Aug. 1980 . 1 female , AM P85824, 33°34'S 151°13'30"E , 5 m , A. R . Jones and A. Murray , 7 Aug. 1981 . 1 individual, AM P85825, 33°33'30"S 151°14'30"E , 5 m , A. R . Jones and A. Murray , 9 Nov. 1982 . Diagnosis . Female and subadult male. Carapace with few scattered spines, without ridges. Telson shorter than pleonite 6. Uropod endopod article 1 longer than articles 2 and 3 together. Adult male . Unknown. Description Ovigerous female. Holotype ovigerous female, AM P53670, 3.2 mm ; paratype ovigerous female, AM P85809. —Carapace with few scattered spines, branchial regions expanded; pseudorostral lobes 0.5 × carapace length, acute; eye lobe 0.08 × carapace length, broader than long, with lenses; carapace 2.5 × length of pereonites together ( Figs 32A–B ). — Paratype ovigerous female, AM P85809. and 3 together, with 1 simple and 1 plumose setae; article 2 0.6 × article 1 length, with 2 plumose and 1 pedunculate setae; article 3 longest, 2.2 × article 2 length, with 1 simple and 1 pedunculate setae; main flagellum of 3 articles, with 2 aesthetascs and 2 simple setae; accessory flagellum of 2 articles, 0.3 × main flagellum length, with 4 simple setae terminally ( Fig. 32C ). —Mandible navicular, with 8 or 11 microserrate setae medially, lacinia mobilis with 3 cusps ( Fig. 32D ). —Maxillule with 2 endites; outer endite with double row of simple setae, 1 pappose and 1 slender simple setae; inner endite with 2 simple, 2 pappose and 1 tricuspid setae; palp with 2 microserrate setae ( Fig. 32E ). —Maxilla with 3 endites; broad endite distal margin lined with simple setae and 3 pappose setae, medial margin with row of pedunculate setae; medial narrow endite with 4 microserrate setae terminally; distal narrow endite with 5 microserrate setae terminally; both narrow endites extending past distal margin of broad endite ( Fig. 32F ). —Maxilliped 1 basis produced as lobe with 4 simple, 2 hook, 7 pappose and 1 stout simple setae; ischium absent; merus with lateral margin lined with fine hair-like setae; carpus 4.5 × merus length, with 4 beak, 8 pappose and 2 simple setae medially, plumose seta laterally; propodus 0.3 × carpus length, with 2 pappose and 2 plumose setae; dactylus 1.2 × propodus length, with 1 dentate and 1 pappose setae ( Fig. 32G ). —Maxilliped 2 basis 0.7 × length of all other articles together, with 3 plumose and 1 pappose setae distally; ischium 0.1 × basis length, unarmed; merus 1.7 ischium length, with pappose seta; carpus 3.6 × merus length, with 6 pappose setae medially and plumose seta laterally; propodus 0.7 × carpus length, with 5 pappose setae medially and plumose seta; dactylus 0.6 × propodus length, with 4 simple setae ( Fig. 32H ). —Maxilliped 3 basis 1.2 × length of all other articles together, with 7 pappose setae medially, broadened and expanded at distolateral corner to mid-merus, with 5 plumose setae; ischium 0.07 × basis length, with pappose seta; merus 2.0 × ischium length, with 1 plumose and 2 pappose setae medially, plumose seta laterally; carpus 1.8 × merus length, with 1 plumose and 4 pappose setae medially, plumose seta laterally; propodus 1.1 × carpus length, with 3 plumose setae medially, plumose seta laterally; dactylus 0.4 × propodus length, with 3 simple setae and 2 simple setae terminally ( Fig. 33A ). —Pereopod 1 basis 0.6 × length of all other articles together, with 14 plumose setae; ischium 0.05 × basis length, unarmed; merus 2.7 × ischium length, with plumose seta; carpus 3.8 × merus length, with 3 simple setae; propodus 1.3 × carpus length, with 11 simple setae; dactylus 0.4 × propodus length, with 13 simple setae and simple seta terminally; exopod 0.8 × basis length, basal article unarmed, flagellum with plumo-annulate setae ( Fig. 33B ). —Pereopod 2 basis 0.9 × length of all other articles together, with 6 plumose setae; ischium 0.06 × basis length, unarmed; 3.0 × ischium length, with 3 plumose setae; carpus 2.3 × merus length, with 5 simple setae; propodus 0.4 × carpus length, with simple seta; dactylus 1.8 × propodus length, with 3 simple setae and 2 simple setae terminally; exopod 1.3 × basis length, basal article unarmed, flagellum with plumo-annulate setae ( Fig. 33C ). —Pereopod 3 basis 1.0 × length of all other articles together, with 12 simple setae; ischium 0.1 × basis length, with simple seta; merus 3.0 × ischium length, with 5 simple setae; carpus 0.7 × merus length, with 2 simple and 4 annulate setae; propodus 0.6 × carpus length, with annulate seta; dactylus 0.4 × propodus length, with simple seta and simple seta terminally ( Fig. 33D ). —Pereopod 4 basis 1.1 × length of all other articles together, with 10 simple setae; ischium 0.03 × basis length, with simple seta; merus 12.0 × ischium length, with 4 simple setae; carpus 0.8 × merus length, with 1 simple and 5 annulate setae; propodus 0.6 × carpus length, with annulate seta; dactylus 0.6 × propodus length, with simple seta and simple seta terminally ( Fig. 33E ). —Pereopod 5 basis 0.8 × length of all other articles together, with 6 simple setae; ischium 0.08 × basis length, with annulate seta; merus 3.7 × ischium length, with 1 simple and 2 annulate setae; carpus 0.8 × merus length, with 2 simple and 6 annulate setae; propodus 0.7 × carpus length, with annulate seta; dactylus 0.3 × propodus length, with simple seta and simple seta terminally ( Fig. 33F ). —Telson 0.7 × length of pleonite 6, without stout lateral setae, 2 small simple terminal setae ( Figs 33G–H ). —Uropod peduncles 2.8 × pleonite 6 length, 3.9 × telson length, with 1 or several simple setae, 13 or 15 simple setae with single subterminal setule medially. Uropod endopod of 3 articles, 0.5 × peduncle length; article 1 1.4 × length of articles 2 and 3 together, with 3 simple setae with single subterminal setule medially; article 2 0.4 × article 1 length, with 2 simple setae with single subterminal setule medially; article 3 0.8 × article 2 length, with 1 simple seta with single subterminal setule medially, simple seta laterally, terminal seta simple. Uropod exopod of 2 articles, 0.8 × length of endopod; article 1 0.4 × article 2 length; article 2 with 7–8 simple setae, terminal seta simple, about as long as article 1 ( Fig. 33G ). Figure 32. Paradiastylis berentsae n. sp. female. Holotype ovigerous female, 3.2 Figure 33. Paradiastylis berentsae n. sp. female. Paratype ovigerous female,AM P85809: (A) , maxilliped 3; (B) , pereopod 1; (C) , pereopod 2; (D) , pereopod 3; (E) , pereopod 4; (F) , pereopod 5; (G) , pleonite 6, telson and uropods; (H) , telson. Scale bars A–G = 0.5 mm, H = 0.1 mm. Etymology . The species is named berentsae for Penny Berents of the Australian Museum. Remarks . The most similar species to Paradiastylis berentsae are P. botanybayensis n. sp. and P. whitleyi . Paradiastylis botanybayensis can be distinguished by the carapace covered in small spines and the telson longer than pleonite 6, while in P. berentsae the carapace has a few scattered spines and the telson is distinctly shorter than pleonite 6. Paradiastylis whitleyi is similar in the uropod endopod proportions, with article 1 being longer than articles 2 and 3 together; however, the telson has a distinct post-anal portion with stout lateral setae, and the species is only known from Western Australia . In comparison, P. berentsae has no post-anal portion or stout lateral setae on the telson, and is only known from New South Wales .